Recent questions tagged Entity

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entity framework - Server-generated keys and server-generated values are not supported by SQL Server Compact

I just started to play with the entity framework, so I decided to connect it to my existing SQL ... installation and using entity framework. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Check if there are any pending changes to be saved

Is there a way to find out whether there are unsaved changes in my entity context, in the Entity Framework? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - EntityFramework: How to configure Cascade-Delete to nullify Foreign Keys

EntityFramework's documentation states that the following behavior is possible: If a foreign key on the dependent entity ... what the MSDN says? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Could not load file or assembly 'EntityFramework' after downgrading EF 5.0.0.0 --> 4.3.1.0

After too hastily upgrading to EF 5.0.0.0 RC and being stuck with a .NET 4.5 project that wouldn't deploy to ... 0.0.0 RC but could find none. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Get Auto Identity Key after Insert via EF

Is there a straight forward way of retrieving a DB auto generated primary key when adding a record via Entity ... the same as on MSSQL See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

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entity framework - Difference between .WithMany() and .WithOptional()?

Below are two similar fluent API configurations: WithMany() modelBuilder.Entity<Country>() .HasRequired(cou => ... .WithOptional() operators? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Many to many mapping with extra fields in Fluent API

I have a many to many relationship and I want to store extra data in the couple-table, using Code First ... has been given correctly yet) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Performance of Linq to Entities vs ESQL

When using the Entity Framework, does ESQL perform better than Linq to Entities? I'd prefer to use Linq to ... 's of using either method. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Add a DbProviderFactory without an App.Config

I am using DbProviderFactories in my data layer (based on Entity Framework) and am using SQLite for my database, ... tied to the data layer. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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entity framework - Only get specific columns

Can I make my EF objects retrieve only specific columns in the sql executed? If I am executing the ... ' to 'Entities.BatchRequest' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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520 views

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entity framework - How can NodaTime be used with EF Code First?

I really want to be able to use NodaTime in my Entity Framework Code First database projects but haven't found ... NodaTime with EF Code First? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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556 views

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entity framework - EF: Validation failing on update when using lazy-loaded, required properties

Given this extremely simple model: public class MyContext : BaseContext { public DbSet<Foo> Foos { get; set; } ... want to update an entity) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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entity framework - Why Navigation Properties are virtual by default in EF

I have following POCO class being used in EF 6.x. My question: Why is the navigation property of 'Posts' under 'Blog' ... Posts { get; set; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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entity framework - Entityframework Join using join method and lambdas

It seems there are different ways to do joins using linq. One is more straightforward and involves just joining ... <categorymap,category, .... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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868 views

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entity framework - EF Code First foreign key without navigation property

Let's say I have the following entities: public class Parent { public int Id { get; set; } } ... navigation property in this particular case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

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entity framework - MEF Plugins and EF CodeFirst - How?

Background: We have a project with many modules. We're using EntityFramework 4.2 with FluentAPI (CodeFirst). There ... token for each plugin). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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450 views

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entity framework - Confusion over EF Auto Migrations and seeding - seeding every program start

I recently changed an application from using the following for dev: DropCreateDatabaseIfModelChanges<Context> To using ... application launch? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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614 views

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entity framework - .NET 4.5 Beta DbGeography NotImplementedException

I have a brand new server which I installed the .NET 4.5 Beta redistributable on. I am getting a NotImplemented ... have saved a day's work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

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entity framework - LINQ To Entities + Include + Anonymous type issue

Consider: Class Client Class Project Class Ticket Class Reply Clients have a sub collection of projects, projects have a ... it work like this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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entity framework - Number of members in conceptual type does not match with number of members on object side type

I'm using .net framework 3.5 SP1. After adding a column to one table in Sql Server (as well as changing an ... I'm going wrong? Thanks, TG See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

1 answer

entity framework - Why does EF5 code first use datetime2 when inserting a nullable datetime into the database?

I am saving a Cart object to the database that has a nullable datetime. This is the error I get: The ... ) set them to nullable datetime. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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577 views

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entity framework - Using the Entry<TEntity>().CurrentValues.SetValues() is not updating collections

I have not run into this before, because I usually handled collections by them selves instead of modifying them ... do I need to manully See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

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entity framework - Using EF Core ThenInclude() on Junction tables

I'm transfering my .NET Framework (EF6) code to ASP.NET Core (EF Core), and I stumbled upon this issue. Here ... one. How do I make this work? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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545 views

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entity framework - EF object comparison with generic types

I have the following problem: I have a generic EF repository using DbContext designed for Int or Guid entity ... primitive types. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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702 views

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entity framework - EF4 LINQ Ordering Parent and all child collections with Eager Loading (.Include())

I am doing hierarchical data binding on a grid, and I need to have the database server perform the sorting on my ... as well in a single query? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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606 views

1 answer

entity framework - AutomaticMigrationsEnabled false or true?

In EF projects, Is there any best practice for setting AutomaticMigrationsEnabled ? More declaration: In our team after ... . thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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606 views

1 answer

entity framework - EF6.0 "The relationship could not be changed because one or more of the foreign-key properties is non-nullable"

If I try to delete a "child" row I always get an exception. Here is a snipset: using (var context = new ... non-nullable/ Any ideas? Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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421 views

1 answer

entity framework - Using SimpleMembership with EF model-first

Can SimpleMembership be used with EF model-first? When I try it, I get "Unable to find the ... the call to InitializeDatabaseConnection. Bob See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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